Dog shelter



FIG. 1 is a front elevational view of a dog shelter, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom view thereof; and,

FIG. 5 is a side elevational view thereof; the opposite side being a mirror image of FIG. 5. 

The ornamental design for a dog shelter, as shown. 